On Mon, Aug 10, 2009 at 08:33:27AM -0400, Mark Hahn wrote: >> Is there a way of finding out within Linux if Hyperthreading is on or >> not? > > in /proc/cpuinfo, I believe it's a simple as siblings > cpu cores. > that is, I'm guessing one of your nehalem's shows as having 8 siblings > and 4 cpu cores.
Googling for 'dmidecode Hyper Thread' I found this 2004 article: http://www.linux.com/archive/articles/41088 And it says: "I would have liked to just read /proc/cpuinfo to determine if Hyper-Threading is enabled, but currently that info is not exported to that file. /proc/cpuinfo just displays the number of physical CPUs in the system and ignores Hyper-Threading. The process of using x86info is similar to the process of using dmidecode: execute and parse the output. In this case, x86info will say _The physical package supports 2 logical processors_ if Hyper-Threading is enabled on a standard Xeon system." Installed x86info in my box, ran it and (correctly) it says my box' physical package supports 1 logical processor. (It's a Pentium 4). -- []'s, RCB. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
